<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>
        {% block title %}
            这是标题
        {% endblock %}
    </title>
    {% block style %}
        
    {% endblock %}
</head>
<body>
{% block header %}
    标题
{% endblock %}
{% block content %}
    内容
{% endblock %}
</body>
{% block js %}

{% endblock %}
</html>